| 摘要 |
An off-centered hour glass shaped coil spring, having a particular utility in thermally responsive switches to bias a sandwich of switch forming elements including a pellet of meltable material and comprising outermost spiral turns which are the coils of maximum diameter at opposite ends of the coil, and off-centered intermediate turns of lesser diameter between the same. These various turns of the coil are such that when the coil spring is compressed, the contiguous portions of the turns will overlap partially and nestle together, so that the longitudinal dimensions of the compressed spring are reduced from that of a conventional coil spring of the same size.
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